Method op beotjlatino sotjnd-box reproduction



E. GRUE NFELDT. METHOD OF REGULATING SOUND BOX REPRODUCTION- arrucmon mm m. I1. 1921.

Beissued May 31, 1921.

UNITED 'sTATEs EIIL GRUENFELDT, OF CLEVELAND, OHIO.

METHOD BEGULATING SbUND-BQX BEPRODUCTIONQ.

Specification of Relssued Letters Patent. Reissued May 31 1921 Original llo. 1,170,580, dated February 8, 1916, Serial No. 1,239, filed January 8, 1915. Application for reluue filed January 17,

.' o all whom it may concern Be it known that I, EMIL Gnirnurnm'r, a. citizen of the United States, residing at Cleveland, in the county of Cuyahoga and sound box or reproducer for a phonograph or like instrument.

The object of my invention is to provide a method whereby the; operator, merely by engaging resiliently the needle arm of a sound box with a regulating mass and moving the same to and fro therealong between the pointsof connection of said needlearm with the diaphragm and the sound boxframe, is 'able to yieldably regulate the essential coaction of the parts to obtain the re roductive efiect desired.

or the purpose of illustration I have, in theaccompanymg drawing, shown and herein described examplesof regulators for sound boxes embodying my invention.

Fi re 1 is a perspective view of a sound I box or a phonograph or like instrument to which is apggied a regulator embodying my invention. ig. Q is aside elevation of the regulator. Fig. 3 is a longitudinal sectional view of the regulator. Fig. 4 is a longitudinal vertical section illustratinga re ulator embodyin my invention, but of s ightly different 9111i. Fig. 5 is'a view on-the line -5-5 of'Fi 4. 1

In the rawing s, 1 represents, as an entirety, a sonndbbx or reproducer of standard construction? a diaphragm thereof, 3

' a needl" arm anda4- the needle.

' 5 indicates asanenti'rety one of my improved-regulators; It .is adapted to be fit-- ted to the needle arm intermediate the diaphragm and the needle socket 015 the needle arm. and to be'adjusted therealong to give thedesired afoot to the. sound reproductlon. Preferably my, regulator consists of a pair of non-metallic resilient yieldable jaws 5,

5", which are resiliently pressed toward each other in any suitable manner,-- the jaws themselves beirli g am. In 1g .1,2 and 3, the jaws 5, 5 are formed in al with a rubber head 6 which may be mo dad or formed in any suitable adapted to engage the needle 1921. Serial No. 488,007.

manner. The rubber piece;6 is formed with a hole 7 through it at the end-of the line.

separating the inner walls of the jaws 5, 5", so as to preclude tearing apart of the piece 6 along the line of the faces of the jaws 5,

' ble or resilient property of'the mass as a whole and of these faces in particular that enables the proper contact to be ha between the regulating mass and the needle. ar inde pendent of the pressure communicated by a the jaws to'the needle bar.

.8, 8 are operating arms for the 'aws 5", 5". They may be incorporated in t e piece 6 when itis molded or may be inserted and held in position inan suitable manner ma be of any suitab e material.

11 Figs. 4 and 5, a modifiedform of. construction is shown in which the arms8 have V lateral extensions 8' pivotally connected together by apivot 9. 10 is a spring surrounding the pivot 9 and having its ends bearing against said arms '8 respectively. Each of the jaws 5, 5*, of any suitable sound deadening or resillent or yieldable material is suitably secured to one end .of one of the arms 8 respectively, the spring 10 serving normally to ress the jaws 5, 5 in en' agement with eac other.

n operation one of my im roved re lators is placed u on the nee le arm 0 the sound box or pro ucer by separatingthe, 'aws 5, 5 and there later is moved up and 'own alon the need e arm fromthe periphery of the aphragm to itscenter in order to re late the sound reproduction as desired. l i e nearer to the center of the diaphragm which the resilient jaws engage the needle arm, the softer will be the 'results produced while the farther fromthe center of the diaphra m the re lator is ad'usted the louder will the e ective repro uction.

Itfwill be noted that the regulator is of simple, chea and durable construction, and that it may e readily and uickly fittedto and too

the needlemrm and adjuste therealong. 5

the obtaining of the desired erative results between" the regulator, 'ne 1e arm and diaphragm, and that this weight may" be proportioned accordingly to get the dssired .results. The resilient or yieldable Q i 15,114 i 'nature of the jaws 5, 5", is important in respect to the muflling of the sound reproduced and the avoidance of mechanical noises between the regulator and the needle arm without the necessit of undue pressure,

which. would undoubte serve largely to defeatthe purposes of the device.

To those skilled in the art many alterah tions in construction and widely differing embodiments and applications of my invention will suggest. themselves, without departing from the spirit and "scope thereof. My disclosures and the description herein are purely illustrative and are not intended to be in any sense limiting!) Having thus described myi'nvention what I claim 1s: ,v J

1. The method of regulating the repro- .duction-of sound from a sound box, which consists in adjustably engaging with the a needle arm of said sound box, between its point of connection with the diaphragm and its point of'connecti'on with said sound box, a mass of yieldable material and sup-- porting said re ualting mass solely by said needle arm an effecting the reproduction desired by utilizing'theweight andyieldability of said' mass and moving the same to and fro along said needle arm.

25Themethod of regulating the reproduction of sound-from 'asound box, which- -consists in adjustably engaging with the needle arm of a sound box, between its point of connection with the diaphragm and its point of connection with the sound box, a regulatingmass of sound deadening material and supportin said re latin mass solely by said need e arm an effecting the reproduction desired by utilizing the weight of said mass and moving the same to and fro along the needle-arm.

' EMIL GRUENFELDT, 

